Improvement in pistons for pumps



. Similar letters of reference indicate corre-l-` understand and construct m be of wood or metal, and provided witha collar or sleeve is 'allowed to slide freely on 4latter having a screw-thread, d, onA it, on which The rod C passes-up through the cylinder A,

'TA COB PATTERSON, OF

lMPROVEMENT IN PI PATENT OFFICE. i

MONROE', NEW YORK.

sToNs FOR PUMPS.

Specification forming part of Letters Patent No. 36,912, dated November ll, 1862.. i

To 'all whom tmc/,y concern.: Be it known that I, JACOB PATTERSON, of Monroe, in the county of Orange and Stateof New York, have invented a new and useful Improvement in Pistons for Pumpsyand I do hereby declare that the following 'is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part ofi-this specification, in whichl Figure l is a Vertical section ofmy invention, taken in tho l-inefx-gx, Fig. 2; Fig.f2, a horizontal section of the same, taken'in the line y gy, Fig. l. .Y

sponding parts in the two figures.

This invention relates to an improvement in the packing of the piston, whereby the lat' ter may alwaysbe kept in proper working Order. f

To enable those'skilled `in the art to fully yinvention, Iy will proceed to 4describe it.

A represents a hollow cylinder, which may' shoulder, a., near its upper part.

B is a collar or sleeve,- which is fitted on the cylinder A below the shoulder c. This the cylinder A, and its lower nd is provided with arins b, and a central ring, c, through which a rod, O, passes, the' lower end oi' the a nut, D, is fitted, as shown clearly in Fig. 1.

and has a. shoulder, e, upon it, underneath which a circular perforated plate, f, iss-placed,

said plate serving as a guard or stop fora valve, E, theseatof which is formed by the upper edge of the cylinder A. The valveE may also be of india-rubber.

F represents a packing of annular form, and fitted o n the cylinderA between the shoulder a andthe collar or sleeve B. This packing is of india-rubber, and is made to t snugly in the pu1npcylinder, so as to produce the necessary/vacuum in the pump-cylinder as the cylinder A is raised. E

The. cy ieder may bclterrn'edthe bex of the .piston,'and at any time when the packing F becomes worn .byl use it may be expanded by turning the nut D, and therebyforcing upward thecollar or sleeve B, the

packing F being compressed between the shoulder a and the collar or sleeve. Thus'by this very simple arrangement the packing may always be kept in perfect working order by Vsimply turning Orscrewing up thenut D whenf ever the packing is worn so as to work loosely in the purnpcylinder. The piston is attached to the rod C, and theinvention is applicable to all pumps.

l Having thus describedniy invent-ion, what I claim as new Patent, ise- The combination of the two open adjustable and desire to secure by Letters cylinders or sleeves A B, open ring,r c, and packing F with the rod G, valve E, perforated plate f, and nut D, alli in the niannerherein shown and described. l

.1 JACOB PATTERSON.' Witnesses: E' l THEODON MOGARRAH,

C. B. NEWKIRK. 

